Question

here is a crossword puzzle :
Clue
1. used water
2. liquid wastes products
3. pipe carrying sewage
4. absorbs ultraviolet rays
5. used to disinfect water
6. solid water extracted in sewage treatment
7. waste matter discharged from human body
8. suspended and dissolved impurities in water
9. trees planted along sewage ponds ​

Answer 1

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